Azo dye.



I I h PAUL JULIUS AND CARL IMMERHEISER, 0F LUDWIGSHAFEN'ON-THE-BHINE, GER- MANY, ASSIGNORS TO .BADISCHE ANILIN & SODA FABRIK, OF LUDWIGSHAFEN-ON- THE-RHINIE, GERMANY, A. CORPORATION.

eas es.

No Drawing.

Specification of Letters Patent.

Application filed May 28, 1913. Serial No. 770,331.

Patented Sept. 23, 1913.

To all whom it may concern:

Be it known that we, PAW. JULIUS and Cam. IMMnRHnIsnn, citizens, respectively, of the Austroliiungarian Empire and of the German Empire, residing at Ludwipgshafenon-the-Rhine, Germany, have invented new and useful Improvements in Azo Dyes, of which the following is a specification.

We have discovered a new coloring matter which can be produced by combining diazotized alpha-naphthylamin with benzoyl-1.8- aminonaphthol-4.6-disulf0nic acid, and which is very valuable in the form of its lakes.

One of the characteristics of our new coloring matter is that on gentle reduction with stannous chlorid and hydrochloric acid, it gives rise to alpha-naphthylamin and an amino compound of benzoyl-1.8-arnino-naphthol-lfi-disulfonic acid.

- The following example will serve to illustrate further the nature of our invention, which, however, is not confined to this example. The parts are by Weight. Diazotize 143 parts of alpha-naphthylamin (which may be done in the usual manner) and run the solution, while stirring, into a solution of 467 parts of the disodium salt of benzoyl- 1.8-amino-naphthol-4i.G-disultonic acid, to which an excess of sodium carbonate has been added. \Vhen the combination is complete, heat the mass to about 80 0., add

common salt, if necessary, and then filter off and press and dry the coloring matter. It is a brown-violet powder which dissolves in water, the solution being red-violet. In the form of its alkaline earth lakes it possesscs brilliant violet shades.

The conversion into lakes can be elfcctod in any manner usually employed for con verting coloring matters into lakes and can be carried out, if desired, without any intermediate isolation of the coloring matter.

Now what we claim is The new azo coloring matter which can be produced by combining diazotized alphanaphthylamin with bcnzoyl-1.8-an1ino-naphtl1o1-4.6-disulfonic acid, which consists when dry of a brown-violet powder which yields a red-violet solution in water and in the form .of its alkaline earth lakes possesses brilliant violet shades, and which upon gentle reduction with stannous chlorid and bydrochloric acid gives rise to .alpha-naphthylamin and an amino derivative of hen zoyl-1.8an1ino-naphthol-ali-disulfonic acid.

In testimony whereof We have hereunto set our hands in the presence of two subscribing witnesses.

PAUL JULIUS.

,ARL IM'IVIERHEISER. Witnesses J. Anne. LLOYD, Josnrn PEER-FER. 

